Glass blowing machine



Och 1933- A. KADOW ET AL GLASS BLOWIVNG MACHINE 2 Sheets-Sheet 1 Filed Feb. 7, 1951 Oct. 24, 1933.

A. KADOW ET AL GLASS BLOWING MACHINE 2 Sheets-Sheet 2 Filed Feb, 7, 1951 have been blown to their final mars PATENT oFricE 1,231,497 GLASS BLOWING MACHINE August Kadow, Toledo, Ohio, and John E.

McLaughlin, Alton, lilL, Illinois Glass Company,

Application February '3,

s Claims.

Our invention relates to machines for blowing bottles, jars or other hollow glassware in molds,

and particularly to means for supplying air to the articles in the finishing molds after they blowing operation.

After an article has its final shape, it is necessary to retain mold to it within the mold a cool it to such an extent that the mold is opened. During this 6., unless the air pressure is reshape after cooling perio form by the usual been blown in the finishing suflicient length of time to it will retain its tained, there is a tendency for the glass to contract or shrink from extent.

of the deformation of the ar time required for cooling.

the present invention is to prolengthens the An object of vide means to overco supplying air to usual blowing oper the blown articles ation and build up a moderate the mold walls to a certain This is objectionable both on account ticle and because it above objections by after the me the pressure within the articles suflicient to prevent them from shrinking in the molds, andv at the same time permit a air in a manner to articles.

Other objects of hereinafter.

In the accompanying Fig. 1 is a part se portion of an .Owens circulation of the blowing, hasten the cooling of the the invention will appear drawings:

ctional elevation view of a suction type bottle machine to which the present invention is applied, and

Fig. 8 is a sectional view of the supply of air to a 6 are views, partly diagram- Figs. 4, 5 and matic, showing the a swinging frame carrying and associated mechanism.

ail sectional elevation showing arm and bottle holding disk car a valve controlling knock-out" arm.

relation of the knock-out arm to the blown article at successive stages in the operation of said arm.

Fig. 7 is a part sectional elevation showing a Fig. 9 is a sectional of one of the blowing heads.

Fig. 10 iS a section ads and disks. 8 is a view similar to Fig. '7, showing the when the disks are seated on elevation on a larger scale at the line X-X on Fig. 9.

Referring particularly to Fig. 1, the invention is shown asapplied to an gathering machine 0 11 carried on a mold Owens type of suction omprising a finishing mold frame 12 mounted to swing assignors to Owensa corporation or ()liio 1931. Serial No. 514,141

up and down on a continuously rotating mold carriage 13. A roll 14 on the frame 12 runs on a cam track 15 which is shaped to control the up and down swinging movement of the mold frame.

Mounted on the frame 12 is a rock shaft 16 which carries a rock arm 17 attached to the rock shaft by means of a head 18. The rock arm is formed at its outer end with'a yoke 19 which carries blowing heads 20 and 21. The heads and the mechanism carried thereby are substantially alike in construction, except that the head 21 is preferably designed for adjustment up. and down in the yoke 19. For this purpose, the head 21 is provided with external screw threads 22 engaging corresponding threads formed in the yoke 19. The head is adjustable up or down by rotating it and is held in adjusted position by a spring detent 23 engaging a ratchet 24 formed on the head.

Each of the blowing heads comprises an air operated piston motor including a piston 25 formed with a piston rod or tube 26 extending downward through the lower end of the blowing head or cylinder. Carried by each piston rod is so a knock-out disk 27 provided with a hollow stem 28 extending upwardly therefrom and having a telescoping connection with the piston rod. The downward movement of the stem 28 relative to the piston rod or tube is limited by a stop collar 5 29 on said stem engaging a shoulder formed on said tube. Aco il spring 30 surrounding the stem 28 is held under compression between the disk and the tube 26. t

Within the cylinder 21 is a coil spring 31 surrounding the tube 26 and bearing upwardly against the piston for holding the latter in its uppermost position except when air pressure is applied above the piston. The head 32 of the cylinder sion or sleeve 33 in which a rod 34 is mounted. The rod 34 is screw threaded to engage corresponding screw threads formed in the upper end of the tube 33 to permit vertical adjustment of the rod. Such adjustment is effected by a hand wheel 35. A clamping nut 36 holds the parts in adjusted position. The rod 34 comprises a section 37 which extends downward through a central bore of a valve 38 mounted in the piston 25. The valve is formed with an annular tapered bearing surface 39 adapted to seat on a correspondingly shaped surface at the upper end of the piston rod 26. The valve is movable upward relative to the piston a limited distance determined by a collar 40 threaded within the piston. 1

is formed with a central tubular exten- 95 I The collar to has portions cut away to provide passageways 4n (Figs. 9 and 10) through which air is admitted when the valve is unseated, as hereinafter set forth. The upward movement of the piston 25 is limited by a stop 42 formed by a downward extension of the cylinder head 32.

The rock shaft 16 is mounted for reciprocation in the direction of its length and also for oscillating movement about its axis, as is customary with heads from a suitable source of continuous air pressure supply (not shown) through an air line 48 extending to the bearing sleeve 47 and thence through the hollow shaft 16 and arm 17 to the blowing heads. A valve 50 (Figs. 1 and 3) within a valve casing 51 mounted on the mold carriage, is periodically opened by a stationary cam 52 operating through a bell crank 53, thereby supplying air under pressure to the line Q8.

The operation is as follows:

During each rotation of the mold carriage, parisons are transferred to the finishing mold 11 and blown to finished form by a blowing head (not shown) in the usual manner. The knockout arm 17 is then actuated by its cam 43 in two steps or stages, as indicated diagrammatically in Figs. 4 to 6. The first step consists in moving the rock shaft downward to an intermediate position (Fig. 4) by an inclined section 43 of the cam. During this movement, the roll 45 is car ried down the inclined section of the 0 slot 46,

thereby rocking the shaft and arm so that the V disks 27 are brought to a position directly above and spaced from the bottles 54 in the finishing mold. The rock arm is held in this intermediate position for a predetermined length of time by a dwell portion of the cam 43. About the time this position is reached, the valve 50 is opened by its cam 52 so that air under pressure is supplied to the cylinders 20 and 21 'above the pistons 25.

The pistons are moved downward by the air pressure and cause the disks 27 to seat on the bottles (Fig. 5). The pistons may move downward a limited distance after the disks are seated, owingto the telescopic connection of the stems 28 with the hollow piston rods. As a piston 25 nears the limit of its downward movement, the valve 38 therein strikes a stop shoulder 55 on the stem 3'7, thus arresting the valve. The piston 25 continues to move downward a short distance after the valve is arrested, thus lifting the valve from its seat and peitting air under pressure to pass through the tube 26 and hollow stem 28 into the bottle 54. The downward movement of the pis-' ton is stopped by the collar 40 seating on the valve 38. The air pressure built up within the bottle when the valve 38 is opened is suflicient to hold the plastic glass in intimate contact with the mold walls and counteract the tendency of the cooling glass to shrink away from the mold walls. This materially shortens the time required for cooling the glass and also prevents distortion of the bottle by a we. go. In order to vary the air pressure aitted to the ware, the point at which the valve 38 is opened as the piston moves down, is adjusted up or down by adjusting the stem 34 as heretofore described. Thus, if the stem 34 is adjusted downward, a comparatively im m great air pressure above the piston 25 will be required to compress the spring 31 suihciently to open the valve 38, and therefore; air under comparatively high pressure is admitted to the ware. By adjusting the stem 34 upward, less air pressure is required to compress the spring to a point where the valve opens, so that the air pressure admitted to the ware is reduced.

In order to prevent excessive air pressure and to maintain the pressure within the bottles at 'a predetermined moderate degree, the tension of the spring 31 is made sumcient to close or partly close the valve 38 and throttle the flow of air when the pressure in the bottle reaches a desired degree. Also, the spring 30 maybe'made of such tension that when the desired pressure is built up within the bottle it will react against the disk 27 and lift it sumciently to relieve or prevent any excess pressure. This also permits a circulation of cooling air through the bottle while a substantially constant predetermined pressure is maintained within the bottle and assists in quickby cooling the glass.

This air pressure is preferably maintained until the bottles approach the discharging position. A

' section 43 of the cam 43 then operates to pull opened, the rock shaft is lifted to release the bottles and permit them to be discharged from the machine.

Modifications may be resorted to within the spirit and scope of our invention.

What we claim is:

1. In a machine for forming hollow glass articles, the combination of a partible mold, a. piston motor, a disk, a stem on the disk having a telescopic connection with the motor piston, said connection providing means whereby the disk is carried by the motor piston and movable thereby into position to seat on a blown article within the mold, means for supplying air under pressure to said motor and thereby actuating the piston, means cooperating with said motor and piston to provide an air passage leading from the motor cylinder through said disk, a valve in said piston,

leading from the valve to and through said disk,

2. In a e for to i hollow glass articles, the combination of a mold, an air motor over e mold'comprising a cylinder and piston,

article holding disk carried by the piston, in for supp air under pressure to the motor and thereby actuating the piston and projec an: id disk into engagement with a blown article in the mold, and means for moving the motor cylinder toward the mold after the disk has engaged said article and thereby positioning the parts for holding the disk on said article inpendently oi air pressure within the motor and supglorting the article d the opening of the mol ii. In a machine for 0 hollow glass articles, the combination of a mold, an air motor over the mold comprising a cylinder and piston,

an article holding disk carried by the piston,, means for supplying air under pressureto the motor and thereby actuating the piston and projecting said disk into engagement with a blown article in the mold, means for directing air under pressure from the motor cylinder to said article within the mold alter the disk is seated on said motor cylinder is said arm,

under pressure article, means for cutting oil the supply of air to the motor, and means for moving the motor cylinder toward the mold before said cutting oil of the air and thereby so positioning the parts that the disk is held seated on the article after the air supply is cut off from the motor and the article supported during the opening of the mold.

i. In a machine for forming hollow glass articles, the combination of a mold, an air motor over the mold comprising a cylinder and piston, an article holding diskvcarried by the piston, meansfor supplying air under pressure to the motor and thereby actuating the piston and projecting said dish into engagement with a blown article in the mold, automatic means. for loweringthe motor cylinder after said engagement of the disk with said article and means cooperating with the motor for holding the disk against said article independently of air pressure when-the in its lowered position.

5. The combination of a mold, an air motor comprising a cylinder and a piston above the mold, a piston rod,- an article holding device carried by sad rod and movable into holding engagement with an article in the mold when the piston is lowered, means ior supplying air to the cylinder above the piston, means cooperating with the piston and piston rod to provide an air passage extending from the cylinder to said holding device, a valve in said air pamage, means to open said valve when the piston is lowered, means for cutting oil the supply of airto the cylinder, and automatic means for lowering the cylinder while said holding device is in engagement with the article in the mold.

6, In a machine for forming hollow glass articles, the combination of a mold, a rock shaft, a rock arm thereon, a piston motor carried by means for rocking said shaft and thereby swinging said motor into and out o! a position over the mold, an article holding disk carried by the motor piston, means for supplying air under pressure to, the motor and thereby actuating the piston to project the holding device with an article in shaft downenga ement for movin the roe engagement thereby moving the article, and means for to remain in holding contact independently of air pressure supplied motor cylinder.

1. A machine for comprising, in combination, riage, a mold rotating therewith,

motor cylinder toward the causing said holding device with the article to the forming hollow glass articles a rotating mold cara rock shaft mounted to travel with the mold carriage, a'

rock arm on said shaft, a blowing device on the rock arm, a cam operable to move the rock shaft lengthwise to an intermediate position, means for causing the rock shaft during said lengthwise movement to rock about its axis and thereby swing the blowing device to a position over the mold, means cooperating with said blowing device ior causing it while in said position to supply cooling air to an the mold durin a predetermined time interval, means operating after said time interval to impart an additional lengthwise movement to the rock shait, and

movementoi the rock shaft to that has been blown in themold.

8. A machine for forming hollow glass articles comprising, in combination, a rotating mold carriage, a mold rotating therewith, a rock shaft mounted to travel with the mold carriage, a rock arm thereon, a blowing head on the rock shaft comprising an air cylinder and piston, an article holding disk carried by the piston, means for moving the rock shaft lengthwise to an intermediate position, means for causing said movement to rock the shaft and swing the blowing head. to a position over the mold, means for applying air under pressure to said cylinder while in said position and projecting said holding disk into engagement with an article in the mold, means to supply air from said blowing head to said article, and means ior imparting an additional lengthwise movem nt to the rock shaft and thereby applying pressure to said said additional hold an article AUGUST xanow. Joan E. ucmoamm,

means carried by the rock arm operative after 

